One-piece arrowhead with cutting blades



1968 c. F. CARROLL, JR 3,3989% ONE-PIECE ARROWHEAD WITH CUTTING BLADESFiled Feb. 23, 1966 2 Sheets-Sheet 1 INVENTOR.

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ONE-PIECE ARROWHEAD WITH CUTTING BLADES Filed Feb. 23, 1966 2Sheets-Sheet 2 ATTORNEYS United States Patent 3,398,960 ONE-PIECEARROWHEAD WITH CUTTING BLADES Cornelius F. Carroll, .Ir., 1310 Tuxedo,Parma, Ohio 44134 Filed Feb. 23, 1966, Ser. No. 529,367 10 Claims. (Cl.273-106.5)

ABSTRACT OF THE DISCLOSURE An arrowhead blade structure which may beformed from a single piece of metal, indexed and locked to theprojectile shaft; the blade structure being readily detach able andreversible in position on the shaft.

The detachability of the blade structure which I have developed permitsa single type shaft to be fitted with a variety of cutting bladesvarying in style, design and pur pose thereby affording the archer witha great deal of selectivity, with the minimum amount of equipment.

It is therefore an object of invention to provide a plurality ofdifferently shaped heads that can be easily detached and reversed inposition on the projectile shaft.

This and other objects of invention will be apparent from the followingspecification and drawings in which:

FIGURE 1 is a side view of a single metal piece which has been cut toform one particular type of blade;

FIGURE 2 is a side view of the blades formed from the single piece ofmetal illustrated in FIGURE 1;

FIGURE 3 is a perspective view of the blade structure formed from themetal piece of FIGURES l and 2;

FIGURE 4 is a perspective view of the blade structure of FIGURE 3inserted on an indexed projectile;

FIGURE 5 is a side view of the broad-head type of blade forming metalpiece;

FIGURE 6 is a perspective view of the broad-head formed blade;

FIGURE 7 is a perspective view of the blade structure and projectileillustrating one type of indexing and locking feature;

FIGURE 8 is a perspective view of another type of locking and indexingstructure;

FIGURE 9 is a perspective view of the partially formed piece of metalwhich forms a blade structure against flying game;

FIGURE 10 is a perspective view of the metal piece of FIGURE 9 showingthe next step in forming the completed blade;

FIGURE 11 is a perspective view of the completed blade of FIGURE 9,mounted on the projectile;

FIGURE 12 is a section view taken along section lines 1212 of FIGURE 7,illustrating the locking and indexing structure.

The first step in producing the blade structure is to cut the metal tothe appropriate shape. FIGURE 1 illustrates one type of blade structuredesign, which I have found to be particularly effective. Blade structure2 is symmetrical above the horizontal axis, and therefore the blades 4are symmetrical. After the single piece of metal is cut to the desiredshape, the blades are formed by bending sections 4 along the cut lines 6as shown in FIGURE 2. The blade structure 2 is then rolled to theconfiguration illustrated in FIGURE 3. After rolling, the blades aretempered to produce an inherent spring tension blade structure.

The final shape of the blade structure is illustrated in FIGURE 3.Blades 4 are symmetrically positioned at 90 angles around thelongitudinal axis. Peripheral shaft portions 5 are spring tensioned as aresult of the heat treating process. By grasping the blades andspreading them apart,

3,398,960 Patented Aug. 27, 1968 that is, by increasing the space 8between portions 5, the

blade structure 2 may be fitted to projectile 9, as illustrated inFIGURE 4. Release of force on the blades when properly positioned onshaft 12, will cause the portions to return to their initial circularposition because of the spring tensor.

Projectile 9 comprises a spike point section 10 and a shaft portion 12,with raised up lip sections 14 and 16. The blade structure 2 is designedto fit between the lip sections 14 and 16, lengthwise on shaft 12.Raised portions 7 provide an indexing and locking mechanism on shaft 12.Thus, the blade structure 2 is positioned on shaft 12, so that theraised portions 7 provide a guide for space 8. When space 8 is fittedabout raised portions 7 so that they are co-extensive, tension on theblades is released thereby locking the blade structure in properposition on the shaft. The blade structure is thus properly positionedso that it cannot revolve around shaft 16, because of upraised portions7.

Blades 4, illustrated in FIGURES 14, comprise four blades spaced atintervals around the peripheral section 5. The arms 17 and 17' of eachblade form a 90 angle as illustrated in FIGURE 3.

Also, as shown in FIGURE 4, the blades 4 made an angle with the shaft ofthe projectile and are set back on the projectile so that point 10primarily provides penetration into the animal. This is quite differentfrom conventional arrowheads wherein the blades must provide the primarypenetration, thereby making it necessary for stilfness for sufficientpenetration.

The blades which I have developed, are unique in that they are usedprimarily for cutting rather than for penetration. Instead the spikepoint 10 of the projectile produces the penetration. Thus the blades areset in a recess on shaft 12 to the rear of penetrating spike point 10.The blades which I have developed will penetrate to some extent, theangle which the blades make with the shaft determining the penetratingeffect of the blades. Thus, the greater the angle, the greater thepenetration. However, my blades have the primary function of cuttingflesh, arteries, and veins to cause hemorrhage to kill the animal.

The type of blade utilized, and the angle that the blade makes with theprojectile may be varied depending upon the type of game being hunted.Also, the angle between the blade arms may be varied. For example, itwill be necessary to use blades of greater penetrability when huntingheavy skinned animals such as pig, than when hunting thinner boned andskinned animals, such as deer.

FIGURES 5 and 6 illustrate a broad-head species of blade construction,which may also be formed from one piece of metal 20. The arms of blades22 are unequal in width and length and form an acute angle. This type ofblade has a wide cutting area relative to the blades illustrated inFIGURES 1-4. Again, it is fitted onto the shaft 12 as illustrated inFIGURE 4, with spike point 10 providing primary penetration of the game.

It is thus possible for the blade construction I have devised to bethinner, and have a wider cutting area than any other four-bladed pointon the market, without sacrificing weight and penetration. Also, thelesser angle of the blades cutting angle coupled with the fact that theshorter length blades can be set back on the spike point, creates aguiding system similar to a missiles fins, virtually eliminating windplaning. The small amount of fiat surfaces exposed minimizes windresistance and noise that is created with many conventional arrowheads.

Thus, an arrowhead comprising a spike point to initially break throughthe hide and bone of the animal before the cutting edges come in contactto cut into the game, is superior to conventional arrowheads. My bladescreate the least amount of drag, and allow the sharp edges of the bladewhich havent been used to puncture the bone, to cut through more flesh,arteries, and veins, thereby producing a sharper cut and thus a moreeffective blow to game. In effect, it produces a larger and sharperopening into the game, and causes hemorrhage at a faster rate, therebybringing more sudden and sure death to any game animal.

Since the blades are symmetrical and detachable, they may be reversed inposition on the shaft, thereby providing double the cutting life, ascompared to a conventional blade. Also my removable blade structureresults in an easy system for interchanging cutting blades differing instyle, design, purpose etc. Thus, different types of blades, as forexample illustrated in FIGURES 3, 6 and 11, may be fitted onto the arrowshaft, thereby producing a variety of cutting points with a minimumnumber of parts. When the blade device is disassembled from theprojectile, the projectile may be used as a practice, or field point.

The spring tension system is particularly desirable, because it enablesthe easy attachment of the blades to a projectile as illustrated inFIGURE 4. To attach the blade structure to the arrow shaft 12, it isonly necessary to bend the blades apart, and fit them over shaft 12. Toremove the 'blade from the shaft, it is merely necessary to grasp bladesA and B (see FIGURE 3), and spread them apart. It is not necessary tospread the blades too far, and the shaft may then be pulled from betweenthe blades.

Another important feature of my invention is the indexing and lockingstructure by which the blade may be securely and properly positioned onthe projectile shaft. FIGURE 4 illustrates one type of indexing andlocking feature in which raised portions 7 are integral with the shaftto properly position and lock the blade structure space 8.

FIGURES 5 and 6 illustrate another type in which tabs 26 and 26 areintegral with the metal piece from which the blades are formed.

The projectile illustrated in FIGURE 7 is provided with slots 44 and 46in lip portions 42' and 42 respectively, on opposite sides of the shaft(180 apart). Also, the shaft defines grooves 48 on each side of the slot46, and connecting therewith. When it is desired to fit the bladeillustrated in FIGURES 5 and 6 onto the shaft illustrated in FIGURE 7,tab '26 is fitted into slot 44 and force is applied to blades 22 toforce tabs 26 together. When they are properly positioned in slot 46,release of the force causes upper tabs 26 to extend by the spring tensorinto grooves 48. Thus, the blade device is securely positioned andlocked on the projectile shaft. This is particularly desirable, since itprevents movement of the blades when the arrow is shot, therebyproducing a more accurate shot. It also effects proper positioning ofthe blades on the projectile.

To remove the blade the reverse is carried out. That is, force isapplied to remove the tabs 26 from grooves 48, and out of slot 46.

Variations of the indexing and locking features are illustrated inFIGURES 1 and 2, in which four tabs, 3, integral with the bladestructure, are shown. In this species, slots 46 and 44 are defined bylips 42 and 42 on the same side of the shaft opposite one another. Tabs3 are fitted into the slots by applying force to the blades, forcingsides 5 together. When they are properly positioned within the slots,tension is released, thereby securely locking and positioning the bladeson the shaft.

Another species of the invention entails using a blade device having twotabs 34, as illustrated in FIGURE 7, opposite one another in the centerof the peripheral ends 33. As in the species illustrated in FIGURES land 2, the arrowhead is then provided with two slots 46 and 44 on thesame side of the shaft, opposite one another, into which indexing andlocking tabs 34 are fitted. Again, when they are properly positioned onthe arrow shaft, tension on the blades is released, enabling the natural4 spring tension of the blade device to lock the blade device securelyonto the arrow shaft.

The various species of blade structures may be used with any of theindexing and locking structures described for maximum variability.

For example, FIGURES 9-11 illustrate another species of blade forkilling flying game. The blades 50 are formed from a single piece ofmetal which is flanged at ends 56. The single piece of metal is foldedin half-FIGURE 10, and the blades are then bent to the configurationillustrated in FIGURE 11. Flange sections 56 may be provided with theindexing and locking features heretofore described, and is then mountedon projectile 58. Alternatively, projectile shaft 60 may be indexed asillustrated in FIGURE 4.

Steel is preferably used to form the blades, but the invention is notlimited to this. I have developed an arrowhead that provides thefollowing:

A. One-piece detachable reversible cutting edge, spring Having thusdescribed by invention I claim the following:

1. An arrowhead comprising:

A. a blade structure comprising a single piece of metal having sides andends, said ends being circularly bent slightly less than 360 so that thesides do not touch,

B. said single piece of metal defining a plurality of similar bladesbetween the ends thereof,

C. said metal forming a spring tension element so that a force greaterthan the force exerted by the spring tension element must be exerted toforce said sides from their normal position; and

D. at least one tab integral with the blade structure at each end ofsaid blade structure to form an indexing and locking means withco-acting interfitting structures on the projectile shaft.

2. The arrowhead as described in claim 1, said arrowhead furthercomprising a spike point section, and a shaft section to detachablyreceive said blade structure, said shaft section further defining slotsinto which said tabs may be securely positioned, for locking andindexing said blade structure on said projectile.

3. The arrowhead as described in claim 2 wherein said blade structure isreversible in position on said projectile.

4. An arrowhead comprising:

A. a blade structure comprising a single piece of metal having sides andends, said ends being circularly bent slightly less than 360 so that thesides do not touch,

B. said single piece of metal defining a plurality of similar bladesbetween the ends thereof,

C. said metal forming a spring tension element so that a force greaterthan the force exerted by the spring tension element must be exerted toforce said sides from their normal position; and

D. each of said blades comprising two arms integral with the bladestructure, said arms forming a angle, the outer edges of said arms beingsharpened.

5. The arrowhead as described in claim 4 wherein said arms form a righttriangle, and wherein said arms form an angle of with an axis extendingfrom end to end of said blade structure.

6. The blade structure as described in claim 4 wherein said arms form anacute angle, and wherein one of the arms of each blade is longer andthicker than the other arm.

7. The arrowhead as described in claim 3 wherein said projectile shaftcomprises lips sections at each end thereof,

said lip sections defining slots into which the corresponding tabs onsaid blade structure are securely fitted thereby forming an indexing andlocking structure.

8. The arrowhead as described in claim 7 wherein there is one tablocated in the middle of each of said ends, and wherein said lips onsaid shaft each define a slot opposite one another on the same side ofthe shaft, into which the tabs may be securely fitted.

9. The arrowhead as described in claim 7 wherein each end comprises twotabs located at the outer extermities thereof, and wherein the lips ofsaid shaft each define a slot into which corresponding tabs on each endof said blade structure are securely fitted.

10. The blade structure as described in claim 7 wherein one end of saidblade structure defines two tabs located at References Cited UNITEDSTATES PATENTS 1,604,713 10/1926 Norlund 273-106.5

ANTON O. OECHSLE, Primary Examiner.

P. SHAPIRO, Assistant Examiner.

